smith



(No Model.) I

J. S. GOLDSMITH & H. H. SMITH.

GONGENTRATOR FOR ARTIFICIAL LIGHT. No. 251,712. Fmsly Patented Jan. 3,1882.

UNITED STATES PATENT OFFICE.

J, SIDNEY GOLDSMITH AND HIRAM H. SMITH, OF NEW YORK, N. Y.

CONCENTRATOR FOR ARTIFICIAL LIGHT.

SPECIFICATION forming part of Letters Patent No. 251,712, dated January 3, 1882.

7 Application filed May 5, [881. (No model.)

and useful Improvement in Concentrators for Artificial Lights, of which the following is a full, clear, and accurate description, reference being bad to the accompanying drawings.

The object of our invention is to form an improved concentrator to increase the brilliancy and illuminating power of artificial lights.

In thedrawings, Figure 1 represents a plan view of ourimprovement. Fig.2 is a side view of the same. Fig. 3 shows the device as applied to a gas-burner.

Our improvement is made as follows: It consists of a solid glass center, A, plain on one surface and convex on the other surface, and provided with an opening, B, for fitting it over the burner of the light, as shownin the drawin gs, D representing the convex surface of center A. G are a number of solid glass arms radiatin g from the center. These arms are formed plain on one surface and rounded or slightly convex on the other surface. These arms are also preferably made of a certain size having relation to the size of the center. Thus when the center is made of three inches diameter the arms are made two and one-half inches long, the sides one-quarter of an inch in thickness at their narrowest and three-eighths of an inch at their thickest portion, and about one inch in width. We have found by careful experiment that if our concentrator is formed in these specific proportions and is placed under and in connection with artificial light it increases and difl'uses the rays of light and prevents any shadow being cast by the concentrator.

The concentrator may, of course, be made of greater or lesssize, and these proportions may be varied, if desired; but the above relative proportions should be preserved between the parts in orderto give the best results.

We areaware that reflectorshavebeen formed with a solid glass disk with a hole in thecenter and without it; but our invention has a great advantage overthis form of reflector, for the reason that the radiating'arms act as a series of additional lenses to increase and diffuse the brilliancy of the light.

We are also aware that there is a semaphore,

"patented as a disk, with lens for ship-lanterns.

used in a horizontal position on the front of a lantern.

We are also aware of the drip-cup and reflector adapted for lamps to catch overflow of oil, and the light to reflect through one ridge of glass.

Our concentrator has the advantage over these reflectors of having its radiating arms act as a series of additionallenses to increase and difiuse the light, as above stated, and has the further advantage of allowing the air to circulate freely between the radiating arms, and thus afford a constant supply of oxygen and a more perfect combustion than is possible with other reflectorsand illuminators.

With our concentrators the brilliancy and power of the light to which they are applied are greatly increased.

Having thus described our invention, what J. SIDNEY GOLDSMITH. HIRAM H. SMITH.

In presence of- LouIs W. Faosr, CHARLES G. Con. 

